5120123121 has 18 divisors (see below), whose sum is σ = 7856371302. Its totient is φ = 3212624640.

The previous prime is 5120123111. The next prime is 5120123131. The reversal of 5120123121 is 1213210215.

It is an interprime number because it is at equal distance from previous prime (5120123111) and next prime (5120123131).

It can be written as a sum of positive squares in 3 ways, for example, as 2728913121 + 2391210000 = 52239^2 + 48900^2 .

It is not a de Polignac number, because 5120123121 - 2⁵ = 5120123089 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 5120123094 and 5120123103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5120123111) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 981660 + ... + 986861.

Almost surely, 2^5120123121 is an apocalyptic number.

5120123121 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

5120123121 is a deficient number, since it is larger than the sum of its proper divisors (2736248181).

5120123121 is a wasteful number, since it uses less digits than its factorization.

5120123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968561 (or 1968541 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 5120123121 is about 71555.0356089633. The cubic root of 5120123121 is about 1723.5615673394.

Adding to 5120123121 its reverse (1213210215), we get a palindrome (6333333336).

The spelling of 5120123121 in words is "five billion, one hundred twenty million, one hundred twenty-three thousand, one hundred twenty-one".